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Thakur A, Verma M, Bharti R, Sharma R. Oxazole and isoxazole: From one-pot synthesis to medical applications. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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2
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Wan Y, Wu J, Ma H, Zhu H, Walsh PJ, Li Y. Copper( i)-catalyzed tandem synthesis of 4,5-functionalized oxazoles from isocyanoacetate and aldehydes. NEW J CHEM 2022. [DOI: 10.1039/d2nj03162k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein is developed a tandem reaction for the synthesis of a diverse array of 4,5-difunctionalized oxazoles utilizing easily-accessible ethyl 2-isocyanoacetate and aldehydes (26 examples, 31–83% yields).
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Affiliation(s)
- Yuting Wan
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Jieqing Wu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Hongfei Ma
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Hongjun Zhu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104-6323, USA
| | - Yufeng Li
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
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Kaur R, Palta K, Kumar M, Bhargava M, Dahiya L. Therapeutic potential of oxazole scaffold: a patent review (2006–2017). Expert Opin Ther Pat 2018; 28:783-812. [DOI: 10.1080/13543776.2018.1526280] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Ramandeep Kaur
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Kezia Palta
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Manoj Kumar
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Meha Bhargava
- Department of Chemistry, Panjab University, Chandigarh, India
| | - Lalita Dahiya
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
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Wu S, Guo Z, Hopkins CD, Wei N, Chu E, Wipf P, Schmitz JC. Bis-cyclopropane analog of disorazole C1 is a microtubule-destabilizing agent active in ABCB1-overexpressing human colon cancer cells. Oncotarget 2016; 6:40866-79. [PMID: 26506423 PMCID: PMC4747374 DOI: 10.18632/oncotarget.5885] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 09/28/2015] [Indexed: 11/25/2022] Open
Abstract
The novel, chemically stabilized disorazole analog, (−)-CP2-disorazole C1 (1) displayed potent anti-proliferative activity against a broad-spectrum of human colorectal cancer cells. HCT15 and H630R1 cell lines expressing high basal levels of the ABCB1 protein, known to cause multi-drug resistance, were also sensitive to growth inhibition by 1 but were resistant to both vincristine and docetaxel, two commonly used microtubule inhibitors. Compound 1 exhibited strong inhibition of tubulin polymerization at a level comparable to vincristine. In addition, treatment with 1 resulted in decreased protein levels of β-tubulin but not α-tubulin. An analysis of cellular proteins known to interact with microtubules showed that 1 caused decreased expression of c-Myc, APC, Rb, and additional key cellular signaling pathways in CRC cells. Treatment with compound 1 also resulted in G2/M cell cycle arrest and induction of apoptosis, but not senescence. Furthermore, endothelial spheroid sprouting assays demonstrated that 1 suppressed angiogenesis and can, therefore, potentially prevent cancer cells from spreading and metastasizing. Taken together, these findings suggest that the microtubule disruptor 1 may be a potential drug candidate for the treatment of mCRC.
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Affiliation(s)
- Shaoyu Wu
- Division of Hematology-Oncology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15232, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA.,Department of Chemistry, School of Pharmaceutical Science, Southern Medical University, Guangzhou 510515, China
| | - Zhijian Guo
- Department of Nephrology, NanFang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Chad D Hopkins
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Ning Wei
- Division of Hematology-Oncology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15232, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Edward Chu
- Division of Hematology-Oncology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15232, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Peter Wipf
- Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA.,Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - John C Schmitz
- Division of Hematology-Oncology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15232, USA.,Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA
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Genetic engineering and heterologous expression of the disorazol biosynthetic gene cluster via Red/ET recombineering. Sci Rep 2016; 6:21066. [PMID: 26875499 PMCID: PMC4753468 DOI: 10.1038/srep21066] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/18/2016] [Indexed: 11/08/2022] Open
Abstract
Disorazol, a macrocyclic polykitide produced by the myxobacterium Sorangium cellulosum So ce12 and it is reported to have potential cytotoxic activity towards several cancer cell lines, including multi-drug resistant cells. The disorazol biosynthetic gene cluster (dis) from Sorangium cellulosum (So ce12) was identified by transposon mutagenesis and cloned in a bacterial artificial chromosome (BAC) library. The 58-kb dis core gene cluster was reconstituted from BACs via Red/ET recombineering and expressed in Myxococcus xanthus DK1622. For the first time ever, a myxobacterial trans-AT polyketide synthase has been expressed heterologously in this study. Expression in M. xanthus allowed us to optimize the yield of several biosynthetic products using promoter engineering. The insertion of an artificial synthetic promoter upstream of the disD gene encoding a discrete acyl transferase (AT), together with an oxidoreductase (Or), resulted in 7-fold increase in disorazol production. The successful reconstitution and expression of the genetic sequences encoding for these promising cytotoxic compounds will allow combinatorial biosynthesis to generate novel disorazol derivatives for further bioactivity evaluation.
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Ralston KJ, Ramstadius HC, Brewster RC, Niblock HS, Hulme AN. Self-Assembly of Disorazole C1 through a One-Pot Alkyne Metathesis Homodimerization Strategy. Angew Chem Int Ed Engl 2015; 54:7086-90. [PMID: 25926364 PMCID: PMC4517162 DOI: 10.1002/anie.201501922] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 03/31/2015] [Indexed: 12/23/2022]
Abstract
Alkyne metathesis is increasingly explored as a reliable method to close macrocyclic rings, but there are no prior examples of an alkyne-metathesis-based homodimerization approach to natural products. In this approach to the cytotoxic C2-symmetric marine-derived bis(lactone) disorazole C1, a highly convergent, modular strategy is employed featuring cyclization through an ambitious one-pot alkyne cross-metathesis/ring-closing metathesis self-assembly process.
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Affiliation(s)
- Kevin J Ralston
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - H Clinton Ramstadius
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - Richard C Brewster
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - Helen S Niblock
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - Alison N Hulme
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK).
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Ralston KJ, Ramstadius HC, Brewster RC, Niblock HS, Hulme AN. Self-Assembly of Disorazole C 1 through a One-Pot Alkyne Metathesis Homodimerization Strategy. ACTA ACUST UNITED AC 2015; 127:7192-7196. [PMID: 27346897 PMCID: PMC4902119 DOI: 10.1002/ange.201501922] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 03/31/2015] [Indexed: 12/27/2022]
Abstract
Alkyne metathesis is increasingly explored as a reliable method to close macrocyclic rings, but there are no prior examples of an alkyne-metathesis-based homodimerization approach to natural products. In this approach to the cytotoxic C2 -symmetric marine-derived bis(lactone) disorazole C1, a highly convergent, modular strategy is employed featuring cyclization through an ambitious one-pot alkyne cross-metathesis/ring-closing metathesis self-assembly process.
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Affiliation(s)
- Kevin J. Ralston
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - H. Clinton Ramstadius
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - Richard C. Brewster
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - Helen S. Niblock
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
| | - Alison N. Hulme
- EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ (UK)
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Abstract
The total synthesis of a bis-cyclopropane analog of the antimitotic natural product (-)-disorazole C(1) was accomplished in 23 steps and 1.1% overall yield. A vinyl cyclopropane cross-metathesis reaction generated a key (E)-alkene segment of the target molecule. IC(50) determinations of (-)-CP(2)-disorazole C(1) in human colon cancer cell lines indicated low nanomolar cytotoxic properties. Accordingly, this synthetic bioisostere represents the first biologically active disorazole analog not containing a conjugated diene or polyene substructure element.
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Affiliation(s)
- Chad D Hopkins
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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Vollmer LL, Jiménez M, Camarco DP, Zhu W, Daghestani HN, Balachandran R, Reese CE, Lazo JS, Hukriede NA, Curran DP, Day BW, Vogt A. A simplified synthesis of novel dictyostatin analogues with in vitro activity against epothilone B-resistant cells and antiangiogenic activity in zebrafish embryos. Mol Cancer Ther 2011; 10:994-1006. [PMID: 21490306 DOI: 10.1158/1535-7163.mct-10-1048] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The natural product (--)-dictyostatin is a microtubule-stabilizing agent that potently inhibits the growth of human cancer cells, including paclitaxel-resistant clones. Extensive structure-activity relationship studies have revealed several regions of the molecule that can be altered without loss of activity. The most potent synthetic dictyostatin analogue described to date, 6-epi-dictyostatin, has superior in vivo antitumor activity against human breast cancer xenografts compared with paclitaxel. In spite of their encouraging activities in preclinical studies, the complex chemical structure of the dictyostatins presents a major obstacle for their development into novel antineoplastic therapies. We recently reported a streamlined synthesis of 16-desmethyl-25,26-dihydrodictyostatins and found several agents that, when compared with 6-epi-dictyostatin, retained nanomolar activity in cellular microtubule-bundling assays but had lost activity against paclitaxel-resistant cells with mutations in β-tubulin. Extending these studies, we applied the new, highly convergent synthesis to generate 25,26-dihydrodictyostatin and 6-epi-25,26-dihydrodictyostatin. Both compounds were potent microtubule-perturbing agents that induced mitotic arrest and microtubule assembly in vitro and in intact cells. In vitro radioligand binding studies showed that 25,26-dihydrodictyostatin and its C6-epimer were capable of displacing [3H]paclitaxel and [14C]epothilone B from microtubules with potencies comparable to (--)-dictyostatin and discodermolide. Both compounds inhibited the growth of paclitaxel- and epothilone B-resistant cell lines at low nanomolar concentrations, synergized with paclitaxel in MDA-MB-231 human breast cancer cells, and had antiangiogenic activity in transgenic zebrafish larvae. These data identify 25,26-dihydrodictyostatin and 6-epi-25,26-dihydrodictyostatin as candidates for scale-up synthesis and further preclinical development.
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Affiliation(s)
- Laura L Vollmer
- Department of Chemistry, University of Pittsburgh Drug Discovery Institute, 10047 Biomedical Science Tower 3, University of Pittsburgh, Pittsburgh, PA 15260, USA
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